Boil the sweet potatoes in salted water for 10 minutes.
Meanwhile, pour the oats into a large bowl and cover with boiling water and soy sauce. Stir well.
Mash the kidney beans or use a food processor to chop them and add them to the bowl. Add thyme, smoked paprika powder, pepper and mustard, and mix well.
In a large pan, sauté the onions and garlic in some cooking oil until translucent.
Drain and mash the sweet potatoes.
Now add the sautéed onions and garlic, mashed sweet potatoes, and psyllium husk powder to the bowl and mix well again.
Lightly oil your hands and shape the mixture into 6-8 balls.
Heat the pan with 1-2 tablespoons of cooking oil and a pinch of salt over medium heat and flatten 3-4 balls with a spatula until they are the size of the bun. Fry on medium heat for 10 minutes on each side until golden brown. You can also use two pans to cook all burger patties at the same time.
Assembling the superfood burgers: toast a burger bun, spread sauce on both sides, layer in patty, lettuce and onion and serve.